Sharpening device



March 11 1924a B. FINE ETYAL SHARPENING DEVICE Filed Dec. 18 1922 567g 6/63 59 im y f W Patented Mar. lill, 1924.

BENJAVIN FNE AND :DANIEL FINE, OF CHICAGO, ILLINOIS.

SHARPENING DEVICE.

Application led December 18, 1922.

To all whom t may concern.'

Be it known that we, BENJAMIN FINE and DANIEL FINE, both citizens of the United States, and residents of Chicago, in the county of Cook and State of Illinois, have invented certain newand useful improvements in Sharpening Devices, ci which the following is a specification.

Our invention relates to an improved simple machine which is particularly adaptable for sharpening the flatand broad pieces of chalk or marking composition used by tai lors and cutters. Among the important objects of the invention are: to provide irnproved adjustment which will adapt the machine for receiving and sharpening diderent sizes of chalk; to provide a construction and arrangement in which the opposed cutting edges are urged yieldingly together to receive the chalk and sharpen it without danger of breaking or marring the marking edge thereof; to provide secure holding means for they chalk so that it will be evenly and accurately sharpened; and in general to provide a simple, compact and efficient device in which chalk can be accurately and rapidly sharpened to the desired marking edge.

The various features of our invention are clearly disclosed in the machine shown on the accompanying drawing, in which- Fig. l is a plan View of the machine,

Fig. 2 is a view from the bottom of the machine,

Fig. 3 is a plan View ot the cutter carriage,

Fig. 4 is a sectional view on plane 4-4, Fig. 1,

Fig. 5 is a sectional view on plane 5-5, Fig. 4, and

Fig. 6 is a sectional view on plane 6 6, Fi

'.gllhe machine comprises the rectangular supporting and protecting housing 10 which can be constructed of sheet metal and for which a cover or top 11 is provided. Secured to the ends of the housing are plates 12- and 13 by means of which the machine may be secured to a suitable support. rThe cover has the longitudinally extending entrance slot 14 for the chalk c, and secured at the right end of the slot is the bracket 15 which has the upwardly extending vertical abutment arm 16 and the abutment arm 17 extending downwardly into the housing. Extending to the left of the slot 14 is the guide slot 18 which receives the slide plate 19 to Serial No. 607,505.

the undelr side of which is secured the bracket 20 having the abutment' arm 21 extending vertically downwardly into the housing. To the top of the plate 19 is secured the bracket 22 having at its inner end the vertically upwardly extending abutment arm, 23, the abutment arms 23 and 21 cooperating with the fixed arms 15 and 16 to hold the chalk against longitudinal displacement. The bracket 2O at its outer end has the downwardly extending lug 24 to which is secured the rod 25, and encircling this rod between the adjacent end wall of the top and the abutment collar 26 on the rod is the compression spring 27. This spring tends to shift the abutment bracket 19 inwardly toward the bracket 15 to clamp the chalk longitudinally. The outer end ot the rod 25 is threaded to receive the adjusting nut 28 by means of which the abutment bracket 19 may be adjusted so that the machine may be adapted for the reception of different lengths of chalk. The upper end of arm 28 is flared, as shown, so that the abutment structure 19 may be automatically shifted to receive and accurately position the chalk. At the outer end of the bracket 22 is the extension 29 forming a finger grip by means of which the adjustable abutment structure may be positively pulled outwardly. Upon release of the finger grip this abutment will be pushed inwardly by the spring to cooperate with the `fixed abutment structure 15 to securely clamp the chalk. Secured on the top of the cover is the sheet metal 'frame 30 which provides the side walls 31 and 32 adjacent the slot 14 for assisting the abutments in holding the chalk in vertical position, the walls having the notches 33 and 34 in which the chalk will be exposed in order that it may be readily taken hold of when inserted in or when being withdrawn from the machine. In order that the cover structure maybe removed from the housing body the housing end wall has the notch 35 for receiving the rod 25. rl`he cover structure may be secured to the body part by means oi" screws 36.

Extending longitudinally in the housing below the cover and supported in the end walls thereof are the two parallel spaced apart guidev rods or bars 37 and 38, and slidably mounted on the rods are the blocks and 40 respectively which are secured together at their bottom corners by cross walls 41 and 42, and these cross walls may be integral with these blocks. Extending transversely of the housing below the rods 37 and 38 and journaled in the .housing side walls is uthe crank shaft 43 which is connected by the connecting rod 44 with the cylindrical section 45 formed at the center of the cross wall 41. A bracket 46 is secured' to the right end wall and in this bracket and the front wall of the housing is journaled the shaft 47 having the crank handle 48 thereon, the shaft 47 carrying a gear 49 which meshes, with the pinion 50 on the crank shaft 43. The blocks 39 and 40Vwith the cross walls 41 and 42 form a knife supportingy carriage and as the crank handle 48 is turned this carriage will be recipro-l cated on the guide rods 37 and 38.

Secured on top of the cross walls 41 and 42between the blocks 39 and 40 and extending longitudinally is the abutment plate 51, the rivet 52 being shown for securing the bar. The block 40 supports a knife or scraper structure K of L-shape transverse section, the base 53 of this structure being secured against the under side of the block 40. Preferably such securing isby means of screws 54 and slots 55 whereby some degree of adjustability is provided for the scraper structure. The vertical wall of the scraper structure is cut vertically and sections of the metal are deflected at right angles to form blades 56, these blades overhanging the abutment plate 51 and the edges thereof being cut on the bias vertically andf sharpened.

Supported on the block 39 is the scraper structure K which is also of L-shape transverse section with its base resting aga-inst the under side of the block, and its vertical wall is cut and the metal deflected to form the blades 57 in opposition to the respective blades on the cutter structure K. The blades on the cutter structure K are also cut on the bias vertically and their edges sharpened on one side. The critter structure K is preferable mounted Vto yield transversely so that the blades will yieldably press against, the chalk and sharpen it without injuring the marking edge. Accordingly we provide guide posts 58 and 59 which may be in the, form of screws which thread transversely into the block 39 at the ends `thereof and which extend through suitable openings in the inner wall of the scraper structure K', with their heads forming abutments for limiting the inward movements of the structure K. On the screws are the washers 60 and 61 respectively between which and the block springs 62 and 63 respectively encircle the posts and the springs tend to force the structure K towards the opposed cutter structure K. The posts being in the'form of screws which thread into the block 39 the maximum inward movement of the structure K can be adjusted for, and set screws 64 and 65 may be provided to lock the posts in adjusted position. The posts together with the engagement of the horizontal wall of the scraper structure on top of the block 39 will hold thestructure to horizontal movement and will prevent tilting thereof.

The operation of the machine is now apparent. The opposed scraper structures K and K form a. Vshape slot for receiving `one edge of the chalk to be sharpened after thechalk has been inserted through the slot 14 and accurately positioned between the movable and rigid structures 19 and 15 respectively. The chalk is thenv secured against 'longitudinal displacement and the cranks 48 is turned while slight pressure is applied on the chalk to feed it gradually downwardly as .it is being shaved. .Such downward pressure will shift the movable cutter structure K slightly against the pressure of the springs 62 and 63, and these springs can then yieldingly press the edges ofthe kblade on Vthe structure K against the chalk and this pressure alsoforces the chalk against the cutting edgesof the stationary structure K.. The edges of all the blades `are sharpened to shave or scrape while the carriage is traveling toward thesta-tionary chalk abut- Y ment 15 and then during return movement of the carrier the blades will travel idly past the chalk while the chalk is. being held against movement bythe force of the spring 27 acting on the movable chalk abutment structure 19. lVhen the. chalk has been pressed downV far enough to bring it against the abutment plate 51 and the movable cutter structure K has been shifted inwardly until it is stopped by the heads of the posts 58 and 59 the blades will nolonger eut and the chalk will have been sharpened.V The degree of fineness of the sharpened edge depends upon the setting of these posts to determine the distance which the opposed cutter struc-tures may come together.

117e thus produce a very simple, compact and efficient chalk sharpening machine which can be used to sharpen Vcha-lk of different sizes and which will give a clean, unbroken, and sharp edge to the chalk. A

Having described our invention we claim as follows: ,Y

l. Ina sharpening machine of the class described, the combination of a housing having a longitudinal chalk entrance slot in its upperl wall, a rigid abutment at one end of said slot,` a spring pressed ,abutment atthe other end of said slot, said abutments re'- ceiving chalkbetween them, a carrier within said housing, means for a reciprocating said carrier longitudinally below saidslot,A

the chalk, and means for supporting/one set of blades to be yieldable transversely. 2. In a sharpening machine of the class described, the combination of a housing hav-Y ing a longitudinally extending slot in its top, a rigid abutment at one end of said slot, a shiftable abutment on said top at the other end of said slot, a rod extending from said shiftable abutment through the adjacent wall of said housing, a spring encircling said rod between said abutment and wall and tending to force said abutment against the stationary abutment whereby chalk inserted in said slot will be clamped against longitudinal displacement, an abutment nut threaded on to said rod outside of said wall for limiting the inner travel of said movable abutment, a carriage reciprocal within said housing below said slot, and opposed knife blades on said carriage for receiving and sharpening the inner end of said chalk.

3. In a sharpening machine ot the class described, the combination of a housing having a longitudinal slot in its top through which chalk to be sharpened may be projected, guide rods within said housing extending parallel with said slot, a carriage 0n said rods, crank mechanism for causing reciprocation of said carriage below said slot, opposed knife blades on said carriage having their edges on the bias in conformity with the shape of the chalk to be sharpened, an abutment plate on said carriage below said blades, a stationary abutment onv said housing extending vertically through one end of said slot to said abutment plate, a movable abutment at the other end of said slot extending vertically therethrough to said abutment plate, a spring urging said movable abutment inwardly whereby chalk which is inserted in said slot will be clamped against longitudinal displacement, and side walls adjacent said slot for holding chalk perpendicular.

4. In a sharpening machine or" the class described, the combination of a housing having a longitudinal slot in its top for the insertion of chalk to be sharpened, guide rods extending longitudinally in said housing, a carriage on said guide rods, crank mechanism for reciprocating said carriage on said rods below said slot, knife structures on said carriage having vertical blades eX- tending towards each other with opposed edges cut on the bias in conformity with the shape of the chalk to be sharpened, springs behind one of said frames for forcing it towards the other frame whereby the inserted chalk will be clamped and sharpened during reciprocation of the carriage, a stationery abutment for said chalk extending through one end of the slot, a movable abutment at the other end of said slot extending downwardly therethrough, and a spring behind said movable abutment tending to torce it towards the stationary abutment whereby the chalk will be held against longitudinal displacement, said blades being sharpened to shave the chalk when the carriage is moving towards the stationary abutment.

In witness whereof, we hereunto subscribe our names this 16th day of December, A. D.

BENJAMIN FINE. DANIEL FINE. 

